package thread;
class Counter2{
    private int count=0;
    public void add(){
        count++;
    }
    public int get(){
        return count;
    }
}
public class Demo19 {
    public static void main(String[] args) throws InterruptedException{
       Counter2 counter2=new Counter2();
       Thread t1=new Thread(()->{
           for (int i = 0; i <50000 ; i++) {
               synchronized (counter2){
                   synchronized (counter2){
                       synchronized (counter2){
                           synchronized (counter2){
                               counter2.add();
                           }
                       }
                   }
               }
           }
       });
       t1.start();
       t1.join();
        System.out.println("count="+counter2.get());
    }
}
